1. Proof-of-stake currencies can be more energy efficient than currencies based on proof-of-work algorithms.2. Under proof of stake "guarding" the coins always own the coins, although several cryptocurrencies do allow or enforce the lending of staking power to other nodes.

As for my own experience with pos, I've been reading much before investing in it. My current choice is Cryptonex project . The profit is 12% annually and CNX price growth is not included in the income. To get the reward from mining, I registered a web wallet, bought some CNX coins, transfered it to windows wallet. And now I just keep it online .So I recommend you have a look at CNX coin, if you are interested in POS mining.